Oxidative degradation of 1,5-naphthalenedisulfonic acid in aqueous solutions by microwave irradiation in the presence of H2O2
Oxidative degradation of 1,5-naphthalenedisulfonic acid in aqueous solutions by microwave irradiation in the presence of H2O2
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DOI：
10.1016/j.chemosphere.2008.11.064
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发表时间：
2009-03-01
期刊：
影响因子：
8.8
通讯作者：
Osella, Domenico
中科院分区：
文献类型：
--
作者：
Ravera, Mauro;Buico, Alessandra;Osella, Domenico
磺化芳香族污染物，如阿姆斯特朗酸或 1,5-萘二磺酸 (NDS)，难以环境破坏和微生物处理。本研究研究了 H2O2 浓度、pH、微波 (MW) 功率和辐照时间对水溶液中 NDS 氧化降解的影响。通过电子顺磁共振自旋捕获证实了羟基自由基作为活性氧化剂的形成。事实证明，H2O2 和 MW 加热的结合对于 NDS 降解至关重要。 [H2O2]:[NDS] 比率 = 10 照射约 20 分钟后，降解因子 >= 70%。发现酸性条件更有利于 NDS 的降解，并且该过程遵循伪一级动力学。使用传统兆瓦反应器扩大工艺规模的尝试并没有取得那么引人注目的结果。 (C) 2008 Elsevier Ltd. 保留所有权利。
Sulfonated aromatic pollutants such as Armstrong's acid, or 1,5-naphthalenedisulfonic acid (NDS), are recalcitrant to environmental breakdown and microbial treatment. This study investigated the effects of H2O2 concentration, pH, microwave (MW) power and irradiation time on the oxidative degradation of NDS in aqueous solutions. The formation of hydroxyl radicals as the active oxidant was confirmed by electron paramagnetic resonance spin trapping. A combination of both H2O2 and MW heating proved essential for NDS degradation. Degradation factors off >= 70% were obtained after about 20 min of irradiation at [H2O2]:[NDS] ratios = 10. Acidic conditions were found to be more favorable to the degradation of NDS, and the process follows pseudo-first-order kinetics. Attempts to scale-up the process using a conventional MW reactor provided less striking results. (C) 2008 Elsevier Ltd. All rights reserved.